CustomAction PatchRemoveFIMPWDPortal returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)

Action ended 12:31:24: InstallExecute. Return value 3.

Cause

We can see from the above highlighted line that we are experiencing a permissions problem. In this case, it is a permission issue inside of SharePoint. The installing users is not part of the Site Collections Administrators.

Resolution

You can resolve the issue by either installing the update with an account that is listed in the Site Collections Administrators, or add the account you are executing the installation to the Site Collection Administrators.